Perpetual pen calendar



Oct. 6, 1970 f c. M. DABLo PERPETUAL PEN CALENDAR 2 Sheets-Sheet 1 FiledJuly l, 1968 FIG. 3

FIG. 4

CESAR M. DABLO JUNE ' SEPT DEC Imi APRJUL I4 31eme 2 le l5 @658299 3@496683 FEBMARNOV SB 4 ls mas so e1 ol lsaslas 02:9@6986 /NVENTOR 2Sheets-Sheet 2 Filed July 1, 1968 @MTW-VFS a EE@ E CESAR M. DABLO AGENTUnited States Patent O 3,531,885 PERPETUAL PEN CALENDAR Cesar M. Dablo,Los Angeles, Calif. (6637 Whitsett Ave., North Hollywood, Calif. 91606)Filed July 1, 1968, Ser. No. 741,715 Int. Cl. G09d 3/06 U.S. Cl. 40-3354 Claims ABSTRACT OF THE DISCLOSURE A juxtaposed ring and sleeve arerotatably mounted on a cylindrical base member. A window is formed inthe sleeve. The peripheries of the base, ring and sleeve contain lettersand numerals denoting calendar information systematically arranged sothat calendar dates may be obtained by rotating the ring and sleeve to apredetermined setting to reveal days of the month through the window.

Background of the invention The present invention relates to calendarsand more particularly to a device having calendar information printedthereon to form a perpetual calendar.

Many reference calendars have been proposed, some of which have appearedin publication usually in columnar or chart form, for determiningcalendar dates of past or future years. However, most of these chartsfor calendars are of limited range and are not relatively easily used.In using such calendars it is usually necessary to follow lines orcolumns in order to match data a plurality of times which frequentlyresults in errors as well as being a tedious procedure. Theinconvenience of cross referencing of information has prevented thistype of calendar from being generally accepted. Furthermore, this typeof calendar usually require reference to and the following of a set ofinstructions.

The present invention eliminates the inconvenience of reading andfollowing instructions and matching cross referenced data byincorporating the calendar information into a compact tubular form whichmay be mounted on or formed with a writing pen.

A pen-type calendar is disclosed by the patent to P. S. Hauton No.1,439,736. However, this calendar is only for a selected seven yearduration. Similarly, the patent issued to E. C. White No. 1,571,828 isfor limited use in that the user selects the particular or current monthdesired.' This calendar cannot be used for determining the day of theweek of past or future dates. My invention, on the other hand, suppliesall information in the form of dates and letters necessary to obtain anydate of the Christian era from the year l to 2099 which also compensatesfor the change from the Julian to the Gregorian calendar. Furthermore,incorporating the calendar with a pen eliminates the book, pamphlet orother media on which the calendar is printed which is not usually asconveniently carried. A calendar arranged in accordance with myinvention may be easily and quickly used, is accurate over a Wide rangeof years and eliminates the necessity of memorizing or keeping availablea set of rules or instructions for obtaining calendar information.

Another type of multi-year calendar is the 100 year calendar usuallyprinted in circular slide rule fashion wherein available space forprinting the numerals of each year limits the coverage of the calendar.

Summary of the invention This invention employs a cyclindrical basemember, preferably a tube, which surrounds and is held by the respectivebody end portions of a fountain pen, or the like. A juxtaposed ring andsleeve surround one end por- 3,531,885 Patented Oct. 6, 1970 tion of thebase member. One end of the base member has imprinted thereon numeralsindicating the century years of the Christian era (l to 2099)selectively arranged and equally spaced circumferentially in twentyonelocations. The opposite end portion of the base mem,

ber is provided with a circumferentially extending repeating series ofthe days of the month arranged in circumferential rows inclined withrespect to the longitudinal axis of the base member and formingtwenty-one equally spaced longitudinally extending rows.

The sleeve, overlying these dates of the month, is provided with awindow exposing the days of a selected month with the days of the weekprinted at one side of the window and the months of the year selectivelyarranged in seven longitudinally equally spaced-apart rows at theopposite side of the window. The ring has the last two digits of theyear, 1 through 99, printed thereon and circumferentially arranged intwenty-one equally spaced rows with every seventh row having a monthselecting symbol such as an arrow. The last two digits of leap years arepreferably printed in red and the leap year affected months of Januaryand February are similarly printed in red, a different case or otherwisedistinguished from the same months of intervening years.

By dividing calendar information into four separate portions, which arerespectively printed in ring-like fashion on the base member andsurrounding ring and sleeve, it is possible to isolate the dates fromthe months, the months from the last two digits 0f the year and the lasttwo digits of the year from the century thus considerably reducing theamount of printing and permitting such compact arrangement. Thus adesired century may be obtained by matching the last two century digitswith the century desired by manual rotation of the ring. Positioning theselected month in alignment with one of the arrows, on the ring, willreveal the dates of that month within the window.

It is, therefore, the principal object to provide a perpetual calendarin the form of tubular members which may be assembled with and form aportion of a pen.

The window in the sleeve is of such size that only onethird of thecircumference of the base member appears therein and hence only the faceof one calendar month appears in the window at any given setting.Furthermore, the grouping of the months of the year has been arranged sothat the monthly calendar phase classifies and groups the twelve monthsinto seven groups to cooperate with the seven days of the week withcompensation for leap year being provided as pointed out hereinabove.

The century section compensates for the calendar change from the Julianstyle to the Gregorian style by printing the seventeenth centurynumerals as 171 and 172.

Brief description of the drawings FIG. 1 is a perspective view of a penhaving the device mounted thereon;

FIG. 2 is an exploded perspective view, to a larger scale, illustratingthe parts on which the calendar information is to be printed;

FIG. 3 is a fragmentary longitudinal cross-sectional view, to a largerscale, taken substantially along the line 3-3 of FIG. l;

FIG. 4 is a fragmentary elevational view illustrating the manner ofusing the calendar information; and,

FIGS. 5, 6 and 7 are development views, to a larger scale, of the threeparts shown by FIG. 2 and illustrating the relative position of calendarinformation when printed thereon.

Description of the preferred embodiment Like characters of referencedesignate like parts in those figures of the drawings in which theyoccur.`

In the drawings:

The reference numeral indicates a substantially conventional pen onwhich the present invention is mounted so that the respective parts ofthe device may be easily manipulated. In its preferred form the device12 comprises a tubular base member 14 of a selected length having adiametrically enlarged ring or annular shoulder 16 at one end portion. Atubular ring 18 surrounds the member 14 adjacent the shoulder 16 while asleeve 20* rotatably surrounds the remaining end portion of the base 14.

Referring to FIG. 3, the pen 10 is divided intermediate its ends to forma bottom section 21 and a top section 22 which are interconnected bythreads 24. The periphery of the pen sections 21 and 22 are providedwith a circumferential recess 26 dimensioned to cooperatively receivethe base member 14 having the ring 18 and sleeve installed thereon. Thepen 10 preferably holds the calendar base member 14 stationary. Thetolerance between the base member 14 and the ring 18 and sleeve 20 ispreferably such that the ring and sleeve may be manually rotated withrespect to the base 14 with sufficient friction present to preventunauthorized movement of either the ring or sleeve. Oher means formaintaining seleced positions of the ring and sleeve with respect to thebase member may be used if desired, such as the well known spring andball entering a series of recesses or sockets, not shown, which indexthe rotative movement of the ring and sleeve. The diameter of the basemember 14 may be selected for the particular size pen for which it is tobe used and is not critical but the relationship of the calendarinformation printed thereon and on the ring and sleeve must bemaintained as hereinafter explained.

Alternatively the calendar device 12 may be formed as a separate unitwherein the base member 14 may be a cylinder instead of tubular andcooperatively receiving the ring and sleeve.

The annular shoulder 16 has printed thereon the gures denoting thecentury years of l through 20. These numerals are spaced, and grouped,around the periphery of the shoulder 16 in twenty-one equallyspaced-apart positions with the numeral 17 denoting the seventeenthcentury repeated once and designated 171 and 172 for distinguishingbetween and compensating for the change and loss of days in adjustingthe calendar from the Julian to the Gregorian in the manner hereinafterexplained.

The other end portion of the base 14 has printed thereon the numerals,indicating a calendar month from 1 to 31, repeated three times injuxtaposed relation around the circumference of the base member byrepeating the numeral 1 every eighth line wherein the normally verticalrows of the calendar dates are equally spaced-apart to form twenty-onerows around the base member parallel with the axis of the pen. The daysof these three calendar months are arranged in circumferentiallyextending spiral lines around the periphery of the base member 14similar to the pitch of a triple thread machine screw. Obviously, anynumber of rows of month days may be used if they are multiples of sevento correspond to the seven days of a week.

As shown in FIG. 5, the rows of the calendar months are aligned with thecentury dates for example the numerals l, 8, 15, 22 and 29, are alignedin one instance with the numeral 3 denoting the third century whilethese same calendar dates of another month are aligned with l0 for thetenth century for the reasons readily apparent.

The intermediate member or ring 18 has printed thereon the last twodigits indicating years from 1 through 99. These numerals are arrangedin spiral sequence extending circumferentially of the ring 18 andgrouped in twentyone circumferentially equally spaced-apart rows so thata selected pair of the last two digits of the years may belongitudinally aligned with the century designation on the shoulder 16.The last two figures of the year which are leap years are distinguishedfrom the other or intermediate years by preferably printing these leapyear numerals in red, however, other designations may be used such as adifferent type face or by boxing the two gures. Adjacent the edge of thering 18, opposite the annular shoulder 16, three symbols such asarrowheads are printed on the ring 18 in equally spaced relation aroundthe ring circumference with the respective symbol or arrowhead alignedwith one of the longitudinal rows of year numerals. The purpose of thesesymbols or arrowheads is for the selection of a month as hereinafterexplained.

The sleeve 20' is provided with a rectangular opening or window 30.Transversely the dimension of the window 30 is substantially equal tothe length of one of the longer rows of calendar months 1 through 3l andlongitudinally the length of the window encompasses the spacing betweenseven longitudinal rows of the calendar month dates. Stated another way,the longitudinal length of the window 30 is equal to one-third of thecircumference of the underlying base member 14, thus the three months ofthe calendar dates printed on the base 14 appears three times insuccession through the window 30` for one complete revolution of thesleeve 20. Along one side of the window indicia is imprinted indicatingdays of the week which are preferably abbreviated as S, M, T, W, T, F, Sand equally spaced-apart in cooperative alignment with the longitudinalextending rows of the calendar month dates. The first S, indicatingSunday, is preferably printed in red or a distinctive type face. Thetwelve months of the year abbreviated in a conventional manner, aregrouped according to the dates on which the respective months may beginand the groups are arranged in seven rows printed in equallyspaced-apart relation parallel with the longitudinal axis of the basemember and adjacent to the side edge of the window 30 opposite the weekday designation. The months are thus adjacent the symbols or arrowsprinted on the ring 18. An extra January is added to the month groupingof April and July and similarly an extra February is added to thegrouping of the month August. These two extra months, January andFebruary, are preferably printed in red and, or a dilferent type face toindicate leap years which alters the length and beginning date,respectively, of these two months.

Operation The operation of the calendar can be best understood byfollowing the steps necessary for locating any particular day, forexample to nd the day of the week of Independence Day or July 4, 1776,hold the pen 10 with its writing tip to point toward the left. If thebase member 14 is not held stationary by the pen it must be heldmanually. Rotate the ring 18 to match the numeral 76 with the centurydesignation 172 on the shoulder 16. Rotate the sleeve 20 to align themonth July with any one of the symbols or arrows on the ring 18. Thecalendar month dates then appearing in the window 30y indicates that the4th of July that year fell on Thursday. Another example is shown by FIG.4 where 67 has been aligned with 19 for the year 1967 with one of thearrows pointing to the month grouping February, March and November whichreveals the dates of a month through the window 30 wherein these threemonths began on Wednesday. Obviously the user must know the length ofthe month, for example, February contained 28 days and November 30. Thissetting agrees with any calendar for these months of the year 1967.

The century 171 is elfective for all dates from Jan. 1, 1700 throughSept. 2, 1752 while the century designation 172 applies to all datesfrom Sept. 14, 1752 through Dec. 31, 1799. The 172 setting compensatesfor the eleven days lost or dropped in September 1752 when the Gregoriantype calendar was adopted by England and the United States.

Obviously the invention is susceptible to some change or alterationwithout defeating its practicability, and I therefore do not wish to beconfined to the preferred embodiment shown in the drawings and describedherein.

I claim:

1. A perpetual calendar, comprising: a cylindrical base member having anannular shoulder at one end, said shoulder having numerals indicatingcentury years printed thereon in equally spaced circumferentialrelation; a ring surrounding said base member adjacent said shoulder,Said ring having numerals indicating the last two years of a centuryprinted therearound in cooperating spaced relation with respect to thecentury years numerals; and a sleeve surrounding the end portion of saidbase member opposite said shoulder, said sleeve having a window, saidbase member having a series of numerals, 1 through 31, indicating daysof the month printed in equally spaced rows around its peripheral endportion opposite said shoulder in such order that any two alignednumerals in adjacent rows ditfer by seven, whereby calendar dates may bedetermined by manually rotating said ring and said sleeve to matchcalendar data.

2. Structure as specified in claim 1 in which the window in said sleeveis dimensioned to reveal the dates of a complete month, said sleevehaving indicia printed thereon, at opposite sides of the window,indicating days of the week and months of the year respectively.

3. Structure as specied in claim 2 in which said base member is tubularfor surrounding a writing instrument.

4. A calendar, comprising:

a cylindrical base member having an annular shoulder at one end,

said shoulder having a progression of numerals denoting a series ofyears printed thereon in cir- 30 cumferential equally spaced relation,the other end portion of said base member having a repeating series ofnumerals, 1 through 31, indicating days of the month printed in equallyspaced rows around its periphery in such order that any two alignednumerals in adjacent rows differ by seven; and a sleeve surrounding theend portion of said base member opposite said shoulder,

said sleeve having a window exposing the days of one month, said sleevehaving letters printed thereon, between said window and said shoulder,indicating months and arranged around an are of the sleeve in sevenequally spaced-apart rows, each longitudinally alignable with therespective year numerals on said shoulder,

said sleeve having other letters printed along the side of said windowopposite the months indicating days of the week.

References Cited UNITED STATES PATENTS 1,425,137 8/1922 Round 40-3351,439,736 12/1922 Hauton 40-335 1,571,828 2/1926 White 40-335 1,695,53912/1928 Draughon 40-335 EUGENE R. CAPOZIO, Primary Examiner L. R.OREMLAND, Assistant Examiner U.S. Cl. X.R. 40-114 October 6, 1970 DatedPatent No.

Cesar M. Dablo 1nventor(s) above-identified patent at error appears inthe d as shown below:

It is certified th e hereby correcte and that said Letters Patent arline 1,

DABLO each o the sheets of drawings e, should read C. M. drawings CESARM. BABLO In the heading t "C. M. BABLO, each occurrenc 1ower right-handside of the occurrence, should read CESAR Mn this 4th day of May. 1971Signed and sealed (SEAL) Attest:

EDWARD M.FLETCHER,JR. Attesting Officer Commissioner of Patents WILLIAME SCHUYLER, JR.

USCOMM-DC 60376-5369 FORM'PO-105O (iO-69) u.s4 savamment summe omet: noo

